Genuine Fine Gems, Jewelry, and Watches

Auction Details

Genuine Fine Gems, Jewelry, and Watches.

All lots are brand new unless stated in the description of the item. Lots are mostly Genuine Diamonds and/or Natural Gemstones. Most lots are in stock and ready to ship. Please see descriptions for more details or you can email us at: info@lagemsanddiamonds.com for questions, please indicate lot number and auction date as your email subject.

***We require working contact number and a valid credit card for ALL Bidders before the auction starts. A non-wo
Choose Your Layout > Switch to Grid View Switch to List View
Natural 20.35 ctw Semi Precious Earring .925 Sterling147320787 - Natural 20.35 ctw Semi Precious Earring .925 Sterling
LA Gems and Diamonds
Natural 20.35 ctw Semi Precious Earring .925 Sterling **|**|** Natural 20.35 ctw Sapphire/Semi Precious Earring .925 Sterling Silver ; MSRP: $150
Bidding Has Concluded
Estimate : 100.00 - 150.00
Sold to floor for (50.00) = 50.00
 
Details...Bookmark
Natural 4.08ctw Pink Tourmaline Round Cut 3-4mm (25)147417889 - Natural 4.08ctw Pink Tourmaline Round Cut 3-4mm (25)
LA Gems and Diamonds
Natural 4.08ctw Pink Tourmaline Round Cut 3-4mm (25) **|**|** Natural Pink Tourmaline ; Round Cut 3-4mm ; 25 Stones ; CTW: 4.08 ; MSRP: $100
Bidding Has Concluded
Estimate : 100.00 - 200.00
Sold to floor for (50.00) = 50.00
 
Details...Bookmark
Natural 26.29ctw Ruby Square Stone147516401 - Natural 26.29ctw Ruby Square Stone
LA Gems and Diamonds
Natural 26.29ctw Ruby Square Stone **|**|** Natural 26.29ctw Ruby Square Cut 26.29ctw ; MSRP: $100
Bidding Has Concluded
Estimate : 100.00 - 750.00
Sold to floor for (50.00) = 50.00
 
Details...Bookmark
Natural 11.59 g Lapis Oval .925 Sterling Silver Pendant147518983 - Natural 11.59 g Lapis Oval .925 Sterling Silver Pendant
LA Gems and Diamonds
Natural 11.59 g Lapis Oval .925 Sterling Silver Pendant **|**|** ; MSRP: $100
Bidding Has Concluded
Estimate : 100.00 - 200.00
Sold to floor for (50.00) = 50.00
 
Details...Bookmark
Diamond EGL Cert. ID:2161078934 Round 0.70 ctw E, VS2147519915 - Diamond EGL Cert. ID:2161078934 Round 0.70 ctw E, VS2
LA Gems and Diamonds
Diamond EGL Cert. ID:2161078934 Round 0.70 ctw E, VS2 **|**|** 5.62-5.60x3.48mm;Cut Very Good; Polish Very Good; Symmetry Very Good; Fluo None; Depth
Bidding Has Concluded
Estimate : 6,500.00 - 8,000.00
Sold to floor for (2,150.00) = 2,150.00
 
Details...Bookmark
Natural 4.14ctw Ceylon Sapphire Square Stone147618654 - Natural 4.14ctw Ceylon Sapphire Square Stone
LA Gems and Diamonds
Natural 4.14ctw Ceylon Sapphire Square Stone **|**|** ; MSRP: $1863
Bidding Has Concluded
Estimate : 1,863.00 - 3,726.00
Sold to floor for (605.00) = 605.00
 
Details...Bookmark
Natural 157.11 ctw African Sapphire Oval Stone147718921 - Natural 157.11 ctw African Sapphire Oval Stone
LA Gems and Diamonds
Natural 157.11 ctw African Sapphire Oval Stone **|**|** ; MSRP: $800
Bidding Has Concluded
Estimate : 800.00 - 1,600.00
Sold to floor for (160.00) = 160.00
 
Details...Bookmark
Natural 31.30 ctw Pearl Earrings/ Pendant .925 Sterling147720295 - Natural 31.30 ctw Pearl Earrings/ Pendant .925 Sterling
LA Gems and Diamonds
Natural 31.30 ctw Pearl Earrings/ Pendant .925 Sterling **|**|** ; MSRP: $400
Bidding Has Concluded
Estimate : 200.00 - 400.00
Sold to floor for (100.00) = 100.00
 
Details...Bookmark
Diamond EGL Certified Marquise 1.16 ctw E, SI1147720529 - Diamond EGL Certified Marquise 1.16 ctw E, SI1
LA Gems and Diamonds
Diamond EGL Certified Marquise 1.16 ctw E, SI1 **|**|** 9.41x5.64x3.45mm;Cut Very Good; Polish Very Good; Symmetry Very Good; Fluo NONE; Depth 61.2%;
Bidding Has Concluded
Estimate : 7,896.00 - 10,528.00
Sold to floor for (3,200.00) = 3,200.00
 
Details...Bookmark
Natural 2.45ctw Emerald Oval Stone147818354 - Natural 2.45ctw Emerald Oval Stone
LA Gems and Diamonds
Natural 2.45ctw Emerald Oval Stone **|**|** Natural Emerald ; Oval Stone ; CTW: 2.45 ; MSRP: $200
Bidding Has Concluded
Estimate : 200.00 - 400.00
Sold to floor for (50.00) = 50.00
 
Details...Bookmark
Natural 4.19ctw Aquamarine Oval (20) Stone147917705 - Natural 4.19ctw Aquamarine Oval (20) Stone
LA Gems and Diamonds
Natural 4.19ctw Aquamarine Oval (20) Stone **|**|** Natural 4.19ctw Aquamarine Oval (20) Stone ; MSRP: $75
Bidding Has Concluded
Estimate : 75.00 - 150.00
Sold to floor for (50.00) = 50.00
 
Details...Bookmark
Natural 0.75ctw Blue Topaz Round .925 Sterling Ring147917929 - Natural 0.75ctw Blue Topaz Round .925 Sterling Ring
LA Gems and Diamonds
Natural 0.75ctw Blue Topaz Round .925 Sterling Ring **|**|** Natural Blue Topaz ; .925 Sterling Silver Ring ; CTW: 0.75 ; MSRP: $150
Bidding Has Concluded
Estimate : 150.00 - 300.00
Sold to floor for (50.00) = 50.00
 
Details...Bookmark
Diamond EGL Certfied Radiant 0.92 ctw G, SI1147920344 - Diamond EGL Certfied Radiant 0.92 ctw G, SI1
LA Gems and Diamonds
Diamond EGL Certfied Radiant 0.92 ctw G, SI1 **|**|** 5.53x4.56x4.13mm;Cut Very Good; Polish Very Good; Symmetry Very Good; Fluo None; Depth 90.6%; Ta
Bidding Has Concluded
Estimate : 4,593.00 - 6,124.00
Sold to floor for (2,350.00) = 2,350.00
 
Details...Bookmark
Natural 1.64ctw Pink Tourmaline Checkerboard Stone148016888 - Natural 1.64ctw Pink Tourmaline Checkerboard Stone
LA Gems and Diamonds
Natural 1.64ctw Pink Tourmaline Checkerboard Stone **|**|** Natural 1.64ctw Pink Tourmaline Checkerboard Stone ; MSRP: $200
Bidding Has Concluded
Estimate : 200.00 - 400.00
Sold to floor for (50.00) = 50.00
 
Details...Bookmark
Natural 21.16ctw Emerald Emerald Cut (3) Stone148118510 - Natural 21.16ctw Emerald Emerald Cut (3) Stone
LA Gems and Diamonds
Natural 21.16ctw Emerald Emerald Cut (3) Stone **|**|** ; MSRP: $400
Bidding Has Concluded
Estimate : 400.00 - 800.00
Sold to floor for (105.00) = 105.00
 
Details...Bookmark
Diamond GIA Cert.ID:2126004518 Round 0.71 ctw D, VVS1148120317 - Diamond GIA Cert.ID:2126004518 Round 0.71 ctw D, VVS1
LA Gems and Diamonds
Diamond GIA Cert.ID:2126004518 Round 0.71 ctw D, VVS1 **|**|** 5.69x5.74x3.56mm;Cut Very Good; Polish Excellent; Symmetry Very Good; Fluo Strong Blue;
Bidding Has Concluded
Estimate : 8,000.00 - 11,000.00
Sold to floor for (3,200.00) = 3,200.00
 
Details...Bookmark
Naturtal 23.55 ctw Tiger Eye Oval Ring 925 Sterling148120683 - Naturtal 23.55 ctw Tiger Eye Oval Ring 925 Sterling
LA Gems and Diamonds
Naturtal 23.55 ctw Tiger Eye Oval Ring 925 Sterling **|**|** ; MSRP: $125
Bidding Has Concluded
Estimate : 75.00 - 125.00
Sold to floor for (50.00) = 50.00
 
Details...Bookmark
Genuine 16" 14k Singapore Gold-Yellow 1.2mm Chain 1.3g148155052 - Genuine 16" 14k Singapore Gold-Yellow 1.2mm Chain 1.3g
LA Gems and Diamonds
Genuine 16" 14k Singapore Gold-Yellow 1.2mm Chain 1.3g **|**|** Chain Size: 16\" ; Metal Purity: 14kt ; Brand: Singapore ; Metal: Gold-Yel...
Bidding Has Concluded
Estimate : 200.00 - 500.00
Sold to floor for (65.00) = 65.00
 
Details...Bookmark
Natural 4.01ctw Amethyst Baguette Mix Size (20) Stone148218074 - Natural 4.01ctw Amethyst Baguette Mix Size (20) Stone
LA Gems and Diamonds
Natural 4.01ctw Amethyst Baguette Mix Size (20) Stone **|**|** Natural 4.01ctw Amethyst Baguette Mix Size (20) Stone ; MSRP: $100
Bidding Has Concluded
Estimate : 100.00 - 200.00
Sold to floor for (50.00) = 50.00
 
Details...Bookmark
Natural 9.6ctw Emerald Round Stone148317562 - Natural 9.6ctw Emerald Round Stone
LA Gems and Diamonds
Natural 9.6ctw Emerald Round Stone **|**|** Natural 9.6ctw Emerald Round Stone ; MSRP: $100
Bidding Has Concluded
Estimate : 100.00 - 200.00
Sold to floor for (50.00) = 50.00
 
Details...Bookmark
Natural 4 Oz Coin Fine Silver USA (4) One Dollar 2011148318452 - Natural 4 Oz Coin Fine Silver USA (4) One Dollar 2011
LA Gems and Diamonds
Natural 4 Oz Coin Fine Silver USA (4) One Dollar 2011 **|**|** Natural Coin Fine Silver USA ; One Dollar 2011 ; 4 Oz ; MSRP: $728
Bidding Has Concluded
Estimate : 728.00 - 1,640.00
Sold to floor for (200.00) = 200.00
 
Details...Bookmark
Natural 2.10 ctw Sapphire Heart Pendant .925 Sterling148319873 - Natural 2.10 ctw Sapphire Heart Pendant .925 Sterling
LA Gems and Diamonds
Natural 2.10 ctw Sapphire Heart Pendant .925 Sterling **|**|** ; MSRP: $250
Bidding Has Concluded
Estimate : 150.00 - 250.00
Sold to floor for (50.00) = 50.00
 
Details...Bookmark
Diamond EGL Certified Round 0.71 ctw H,VS2148320591 - Diamond EGL Certified Round 0.71 ctw H,VS2
LA Gems and Diamonds
Diamond EGL Certified Round 0.71 ctw H,VS2 **|**|** 5.85x5.82x3.40mm;Cut Very Good; Polish Very Good; Symmetry Very Good; Fluo None; Depth 58.3%; Tabl
Bidding Has Concluded
Estimate : 4,293.00 - 5,724.00
Sold to floor for (1,750.00) = 1,750.00
 
Details...Bookmark
Suisse 1 gram Fine Gold (999.9) Serial No. 432898,24 CT148414332 - Suisse 1 gram Fine Gold (999.9) Serial No. 432898,24 CT
LA Gems and Diamonds
Suisse 1 gram Fine Gold (999.9) Serial No. 432898,24 CT **|**|** Suisse 1 gram Fine Gold (999.9) Serial No. 432898 24 CARAT ; MSRP: $360
Bidding Has Concluded
Estimate : 300.00 - 600.00
Sold to floor for (90.00) = 90.00
 
Details...Bookmark
Natural 4.42ctw Aquamarine Oval (20) Stone148417725 - Natural 4.42ctw Aquamarine Oval (20) Stone
LA Gems and Diamonds
Natural 4.42ctw Aquamarine Oval (20) Stone **|**|** Natural 4.42ctw Aquamarine Oval (20) Stone ; MSRP: $75
Bidding Has Concluded
Estimate : 75.00 - 150.00
Sold to floor for (50.00) = 50.00
 
Details...Bookmark
Natural 2.25ctw Peridot Round .925 Sterling Silver Ring148517928 - Natural 2.25ctw Peridot Round .925 Sterling Silver Ring
LA Gems and Diamonds
Natural 2.25ctw Peridot Round .925 Sterling Silver Ring **|**|** Natural Peridot Round ; .925 Sterling Silver ; CTW: 2.25 ; MSRP: $150
Bidding Has Concluded
Estimate : 150.00 - 300.00
Sold to floor for (50.00) = 50.00
 
Details...Bookmark
Natural 3.11ctw Pink Tourmaline Round 3-3.5mm (29)148518129 - Natural 3.11ctw Pink Tourmaline Round 3-3.5mm (29)
LA Gems and Diamonds
Natural 3.11ctw Pink Tourmaline Round 3-3.5mm (29) **|**|** Natural Pink Tourmaline ; Round ; 3-3.5mm ; 29 stones ; CTW: 3.11 ; MSRP: $100
Bidding Has Concluded
Estimate : 100.00 - 200.00
Sold to floor for (50.00) = 50.00
 
Details...Bookmark
Diamond GIA Cert.ID:1136669708 Round 1.00 ctw F, SI1148520225 - Diamond GIA Cert.ID:1136669708 Round 1.00 ctw F, SI1
LA Gems and Diamonds
Diamond GIA Cert.ID:1136669708 Round 1.00 ctw F, SI1 **|**|** 6.24-6.29x4.03mm;Cut Very Good; Polish Good; Symmetry Very Good; Fluo None; Depth 40.8%;
Bidding Has Concluded
Estimate : 15,000.00 - 20,000.00
Sold to floor for (5,750.00) = 5,750.00
 
Details...Bookmark
Natural 2.65ctw Ceylon Sapphire Oval Stone148618656 - Natural 2.65ctw Ceylon Sapphire Oval Stone
LA Gems and Diamonds
Natural 2.65ctw Ceylon Sapphire Oval Stone **|**|** ; MSRP: $1191
Bidding Has Concluded
Estimate : 1,191.00 - 7,146.00
Sold to floor for (395.00) = 395.00
 
Details...Bookmark
Natural 5.36g CZ Ring .925 Sterling Silver148717332 - Natural 5.36g CZ Ring .925 Sterling Silver
LA Gems and Diamonds
Natural 5.36g CZ Ring .925 Sterling Silver **|**|** Natural 5.36g CZ Ring .925 Sterling Silver ; MSRP: $100
Bidding Has Concluded
Estimate : 100.00 - 200.00
Sold to floor for (50.00) = 50.00
 
Details...Bookmark
Natural 3.54ctw Emerald Oval Stone148718389 - Natural 3.54ctw Emerald Oval Stone
LA Gems and Diamonds
Natural 3.54ctw Emerald Oval Stone **|**|** Natural Emerald; Oval Stone ; CTW: 3.54 ; MSRP: $200
Bidding Has Concluded
Estimate : 200.00 - 400.00
Sold to floor for (50.00) = 50.00
 
Details...Bookmark
Diamond EGL Certified Round 0.70 ctw D,SI2148720595 - Diamond EGL Certified Round 0.70 ctw D,SI2
LA Gems and Diamonds
Diamond EGL Certified Round 0.70 ctw D,SI2 **|**|** 5.64x5.59x3.60mm;Cut Very Good; Polish Very Good; Symmetry Very Good; Fluo None; Depth 64.2%; Tabl
Bidding Has Concluded
Estimate : 4,515.00 - 6,020.00
Sold to floor for (1,850.00) = 1,850.00
 
Details...Bookmark
Natural 23.84ctw Emerald Pear Shape (7) Stone148818516 - Natural 23.84ctw Emerald Pear Shape (7) Stone
LA Gems and Diamonds
Natural 23.84ctw Emerald Pear Shape (7) Stone **|**|** ; MSRP: $200
Bidding Has Concluded
Estimate : 200.00 - 400.00
Sold to floor for (50.00) = 50.00
 
Details...Bookmark
Natural 5.69ctw Emerald Oval Stone148917533 - Natural 5.69ctw Emerald Oval Stone
LA Gems and Diamonds
Natural 5.69ctw Emerald Oval Stone **|**|** Natural 6.02ctw Emerald Oval Stone ; MSRP: $100
Bidding Has Concluded
Estimate : 100.00 - 200.00
Sold to floor for (50.00) = 50.00
 
Details...Bookmark
Natural 2.5 ctw Sapphire Oval .925 Sterling Silver Ring148919034 - Natural 2.5 ctw Sapphire Oval .925 Sterling Silver Ring
LA Gems and Diamonds
Natural 2.5 ctw Sapphire Oval .925 Sterling Silver Ring **|**|** ; MSRP: $200
Bidding Has Concluded
Estimate : 200.00 - 400.00
Sold to floor for (50.00) = 50.00
 
Details...Bookmark
GIA Certified Emerald Cut Diamond 1.00 E VVS1148920373 - GIA Certified Emerald Cut Diamond 1.00 E VVS1
LA Gems and Diamonds
GIA Certified Emerald Cut Diamond 1.00 E VVS1 **|**|** Cut Very Good Polish Excelleny Symmetry Very Good Fluorescence Faint Depth 71.2% Table 64% Meas
Bidding Has Concluded
Estimate : 14,000.00 - 18,000.00
Sold to floor for (5,750.00) = 5,750.00
 
Details...Bookmark
Natural 47.36ctw Ruby Square Stone149016405 - Natural 47.36ctw Ruby Square Stone
LA Gems and Diamonds
Natural 47.36ctw Ruby Square Stone **|**|** Natural 47.36ctw Ruby Square Cut 47.36ctw ; MSRP: $100
Bidding Has Concluded
Estimate : 100.00 - 750.00
Sold to floor for (50.00) = 50.00
 
Details...Bookmark
Natural 1.86ctw Ceylon Sapphire Oval Stone149118659 - Natural 1.86ctw Ceylon Sapphire Oval Stone
LA Gems and Diamonds
Natural 1.86ctw Ceylon Sapphire Oval Stone **|**|** Natural 1.86ctw Ceylon Sapphire Oval Stone ; MSRP: $837
Bidding Has Concluded
Estimate : 837.00 - 5,022.00
Sold to floor for (350.00) = 350.00
 
Details...Bookmark
Natural 31.8 ctw Sapphire Oval .925 Sterling Ring149118763 - Natural 31.8 ctw Sapphire Oval .925 Sterling Ring
LA Gems and Diamonds
Natural 31.8 ctw Sapphire Oval .925 Sterling Ring **|**|** ; MSRP: $400
Bidding Has Concluded
Estimate : 400.00 - 800.00
Sold to floor for (50.00) = 50.00
 
Details...Bookmark
Diamond EGL Certified Pear 1.14 ctw G, SI2149120519 - Diamond EGL Certified Pear 1.14 ctw G, SI2
LA Gems and Diamonds
Diamond EGL Certified Pear 1.14 ctw G, SI2 **|**|** 8.69x5.53x3.67mm;Cut Very Good; Polish Very Good; Symmetry Very Good; Fluo None; Depth 66.4%; Tabl
Bidding Has Concluded
Estimate : 5,688.00 - 7,584.00
Sold to floor for (2,750.00) = 2,750.00
 
Details...Bookmark
Genuine 16" 14k  Gold-Yellow  3.8mm Rolo  Chain 7.8g149155065 - Genuine 16" 14k Gold-Yellow 3.8mm Rolo Chain 7.8g
LA Gems and Diamonds
Genuine 16" 14k Gold-Yellow 3.8mm Rolo Chain 7.8g **|**|** Chain Size: 16\" ; Metal Purity: 14kt ; Brand: Italian ; Metal: Gold-Yellow ...
Bidding Has Concluded
Estimate : 1,300.00 - 2,900.00
Sold to floor for (365.00) = 365.00
 
Details...Bookmark
Natural 2.96ctw Pink Tourmaline Trillion Cut 4.5mm (12)149217792 - Natural 2.96ctw Pink Tourmaline Trillion Cut 4.5mm (12)
LA Gems and Diamonds
Natural 2.96ctw Pink Tourmaline Trillion Cut 4.5mm (12) **|**|** ; MSRP: $100
Bidding Has Concluded
Estimate : 100.00 - 200.00
Sold to floor for (50.00) = 50.00
 
Details...Bookmark
Natural 44.48ctw Ruby Emerald Cut Stone149316391 - Natural 44.48ctw Ruby Emerald Cut Stone
LA Gems and Diamonds
Natural 44.48ctw Ruby Emerald Cut Stone **|**|** Natural 44.48ctw Ruby Emerald Cut 44.48ctw ; MSRP: $675
Bidding Has Concluded
Estimate : 100.00 - 1,350.00
Sold to floor for (50.00) = 50.00
 
Details...Bookmark
Diamond EGL Cert. ID:3101507320 Round 1.15 ctw D, Si3149319953 - Diamond EGL Cert. ID:3101507320 Round 1.15 ctw D, Si3
LA Gems and Diamonds
Diamond EGL Cert. ID:3101507320 Round 1.15 ctw D, Si3 **|**|** 6.80-6.77x3.79mm;Cut Very Good; Polish Very Goodt; Symmetry Very Good; Fluo None; Depth
Bidding Has Concluded
Estimate : 8,144.00 - 11,000.00
Sold to floor for (3,225.00) = 3,225.00
 
Details...Bookmark
Natural 22.70 ctw Tanzanite Oval Ring .925 Sterling149320643 - Natural 22.70 ctw Tanzanite Oval Ring .925 Sterling
LA Gems and Diamonds
Natural 22.70 ctw Tanzanite Oval Ring .925 Sterling **|**|** ; MSRP: $500
Bidding Has Concluded
Estimate : 300.00 - 500.00
Sold to floor for (100.00) = 100.00
 
Details...Bookmark
Natural 1.88ctw Ceylon Sapphire Oval Stone149418666 - Natural 1.88ctw Ceylon Sapphire Oval Stone
LA Gems and Diamonds
Natural 1.88ctw Ceylon Sapphire Oval Stone **|**|** ; MSRP: $846
Bidding Has Concluded
Estimate : 846.00 - 5,076.00
Sold to floor for (285.00) = 285.00
 
Details...Bookmark
Natural 4.01ctw Pink Tourmaline Round Cut 3-4mm (25)149517833 - Natural 4.01ctw Pink Tourmaline Round Cut 3-4mm (25)
LA Gems and Diamonds
Natural 4.01ctw Pink Tourmaline Round Cut 3-4mm (25) **|**|** ; MSRP: $100
Bidding Has Concluded
Estimate : 100.00 - 200.00
Sold to floor for (50.00) = 50.00
 
Details...Bookmark
Diamond GIA Cert.:2131341091 Rectangle Mod 1.00ct H VS1149520250 - Diamond GIA Cert.:2131341091 Rectangle Mod 1.00ct H VS1
LA Gems and Diamonds
Diamond GIA Cert.:2131341091 Rectangle Mod 1.00ct H VS1 **|**|** 5.86x5.14x3.74mm;Cut Very Good; Polish Excellent; Symmetry Very Good; Fluo Faint; Dep
Bidding Has Concluded
Estimate : 11,000.00 - 17,500.00
Sold to floor for (5,000.00) = 5,000.00
 
Details...Bookmark
Natural 0.68 ctw Smokey Topaz 6x6 Ring .925 Sterling149520834 - Natural 0.68 ctw Smokey Topaz 6x6 Ring .925 Sterling
LA Gems and Diamonds
Natural 0.68 ctw Smokey Topaz 6x6 Ring .925 Sterling **|**|** ; MSRP: $75
Bidding Has Concluded
Estimate : 50.00 - 75.00
Sold to floor for (50.00) = 50.00
 
Details...Bookmark
Natural 167.1ctw Genuine Emerald Cabushion Stone149616357 - Natural 167.1ctw Genuine Emerald Cabushion Stone
LA Gems and Diamonds
Natural 167.1ctw Genuine Emerald Cabushion Stone **|**|** Natural 167.10ctw Geniune Emerald Cabushion 167.10ctw ; MSRP: $1700
Bidding Has Concluded
Estimate : 1,700.00 - 3,400.00
Sold to floor for (170.00) = 170.00
 
Details...Bookmark