A look at what is currently available on eBay
What is the difference between a 2carat tiffany ring and a 2 carat ring from a normal jewellar?
So i was just being a girl and looking at diamond rings from tiffany and co...i noticed that a diamond engagement ring from tiffany and co which is 2 carat is nothing under 20,000 but then when i looked at a normal jeweler shop a 2 carat ring is almost half the price...why is this? and is 2 carat a good size for a ring?
probably because of the quality and brand name that comes along with tiffany. just how like with clothes if there's a black dress at target for $30 and one for $100 at bcbg, even though it's more expensive, you might wanna go with bcbg just because its a popular brand name known for being trustworthy, well-fitting, and overall great lasting quality 
Items recently purchased from this site
TIFFANY & CO 4.5ct 6-PRONG SOLITAIRE DIAMOND & PLATINUM RING + BOX & CERTIFICATE, Tiffany & Co PLAT Diamond Engagement Ring 4.42Ct F-VS1, Tiffany & Co. 4.00 ct Cushion Legacy H VS2 Diamond Ring $250,000.00 RET 25% OFF, Tiffany & Co PLAT Round & Baguette Diamond Ring 3.68CT, Tiffany & Co 4.29 ct Alexandrite & Diamond Ring, GEM!!!, TIFFANY & Co. 6.26 cts EMERALD, DIAMOND & PLATINUM RING - Classy & Timeless!, Tiffany & Co PLAT Princess & Square Accents Diamond Engagement Ring 4.13Ct, TIFFANY & CO. SCHLUMBERGER 8cts 6 Bee Sapphire Diamond Platinum 18k Gold Ring, Tiffany & Co PLAT Pear&Trillion Cut Diamond Ring 4.37CT, Tiffany & Co PLAT Lucida & Trillion Diamond Ring 2.74CT, TIFFANY & CO. PLATINUM & CERTIFIED 3.04 CT ROUND DIAMOND SOLITAIRE RING, TIFFANY & CO 3.02 CARAT LUCIDA DIAMOND PLATINUM RING, Tiffany & Co PLAT Round Diamond Solitaire Ring 2.54Ct H-VS1, EXTREMELY RARE! AUTHENTIC TIFFANY & CO PLATINUM DIAMOND RED SPINEL RING PAPERS, Tiffany & Co PLAT Lucida Diamond Solitaire Ring 2.01CT E-VS1, Tiffany & Co PLAT Pear Shape & Bullet Diamond Ring 2.83CT, RARE BLUE BOOK SPECIAL! AUTHENTIC TIFFANY & CO PLATINUM DIAMOND PINK SPINEL RING, 2.24ct Round Brilliant Cut Diamond Engagement Anniversary Ring By Tiffany & Co., Tiffany & Co PLAT Round Diamond Solitaire Ring 2.03Ct I-VVS1, Tiffany and Co. Platinum Engagement Ring and 2.16c G.I.A. certified diamond , Tiffany & Co Platinum Plat 1.68ct D VS1 Lucida Diamond Solitaire Engagement Ring, Tiffany & Co PLAT Oval Diamond Solitaire Ring 2.05CT , Tiffany & Co PLAT 3Stone Emerald Cut Diamond Ring 2.98C, TIFFANY & CO 2.27 CARAT LUCIDA DIAMOND RING, Tiffany & Co. Plat 1.51 ct Heart VVS2 E Diamond Ring $42,000 RET 30% OFF, Tiffany & Co PLAT 3Stone Diamond Engagement Ring 2.72CT G-VVS2-1, Tiffany & Co PLAT Legacy Graduated Diamond Engagement Ring 2.41CT, Tiffany & Co PLAT Lucida Diamond Solitaire Ring 1.96CT H-VVS2, TIFFANY & CO PLATINUM 3.00ctw DIAMOND ENGAGEMENT RING, TIFFANY & CO PLATINUM DIAMOND ENGAGEMENT RING SIZE 5.25, Tiffany & Co Platinum 3-Stone 2.58ct tw Lucida Diamond Engagement Ring, Tiffany & Co PLAT Diamond Channel Set Engagement Ring, RARE! AUTHENTIC TIFFANY & CO PLATINUM DIAMOND VIOLET SPINEL RING PAPER BOX, TIFFANY & CO 18K Gold Plat 2.47 H-VVS2 Diamond Ring, Tiffany & Co PLAT Emerald Trapeze Diamond Ring 1.93CT, Tiffany & Co. 2.42 ct. Kashmir Sapphire & Diamond Ring, Tiffany & Co PLAT Heart Shape Diamond Solitaire Ring , Tiffany & Co Platinum Legacy Diamond Ring 2.16CT H-IF, Tiffany & Co PLAT Round Diamond Solitaire Engagement Ring 1.50Ct G-VVS1, Tiffany & Co. PLATINUM Round Diamond E/VVS1 1.18ct Engagement Ring Solitaire , RARE! AUTHENTIC TIFFANY & CO PLATINUM 7.76CT SPESSARTITE GARNET DIAMOND RING, Tiffany & Co PLAT Round & Baguette Diamond Ring 1.98CT, Tiffany & Co PLAT Round Brilliant Diamond Bead Border Set Engagement Ring 1.91CT, TIFFANY + CO 1940 14K NO HEAT 4.90CT PURPLISH BLUE CUSHION SAPPHIRE DIAMOND RING, Tiffany & Co Halo G/VVS1 Diamond Engagement Ring Solid Platinum $29,100 Retail, SALE ---- TIFFANY & CO 1.4ct D VVS2 LUCIDA DIAMOND ENGAGEMENT RING + BOX/PAPERS, TIFFANY EMERALD & DIAMOND RING - REDUCED, Tiffany & Co PLAT Legacy Graduated Diamond Engagement Ring 2.06CT, TIFFANY & CO 18K GOLD PLATINUM 1.81ct DIAMOND TRIPLE EXCELLENT ENGAGEMENT RING, Tiffany & Co PLAT Lucida Diamond Solitaire Ring 1.65CT I-VVS1, RARE! AUTHENTIC TIFFANY & CO PLATINUM DIAMOND 4.63CT ROUND PURPLE SAPPHIRE RING, RARE! AUTHENTIC TIFFANY & CO PLATINUM DIAMOND OVAL 4.20CT RED SPINEL RING, STATEMENT JEWELRY! AUTHENTIC TIFFANY & CO PLATINUM DIAMOND PINK TOURMALINE RING, TIFFANY & CO JEAN SCHLUMBERGER PLATINUM 18K GOLD DIAMOND BLUE TOURMALINE RING, TIFFANY & CO PLATINUM LEGACY 1.43ct DIAMOND RING E VVS1, MINT! TIFFANY & CO. PLATINUM DIAMOND ENGAGEMENT RING, Tiffany & Co 1.13 Ct Diamond Solitaire Engagement Ring, $37990 1.47CT TIFFANY & CO. GIA CERTIFIED 3 STONE DIAMOND ENGAGEMENT RING PLAT, Tiffany & Co. 1.51 Carat Round Diamond Engagement Ring GIA Certified H, VS-2, Authentic Tiffany & Co. Legacy 1.33 Cts Diamond Engagement Ring Size 6...BH, TIFFANY & CO 1.31CT G VVS2 ROUND DIAMOND PLAT RING, Tiffany Co Platinum Legacy Ring Diamond 1.36ctw VVS2 F 1.08ct Cushion Engagement, Tiffany & Co PLAT Radiant Diamond Solitaire Ring 1.49Ct, TIFFANY & CO PLATINUM AQUAMARINE HALFMOON DIAMOND RING, Tiffany & Co Platinum Emerald Cut Diamond Engagement Ring 1.52Ct I-VS1, Tiffany & Co Platinum Legacy Diamond Ring 1.38Ct F-VVS1, 2 TIFFANY PLATINUM DIAMOND ENGAGEMENT & WEDDING RINGS, TIFFANY & CO LUCIDA DIAMOND ENGAGEMENT RING 0.92 ct D VVS1 W/ CERTIFICATE!!!!, Tiffany & Co Platinum Legacy Diamond Ring 1.33Ct G-VVS1, Tiffany & Co PLAT Round Diamond Solitaire Ring 1.10CT, Tiffany & Co PLAT Sapphire Diamond 3-Stone Ring 3.13CT, Tiffany & Co Platinum Legacy Diamond Ring 1.44Ct G-VVS2, Tiffany & Co Platinum Etoile Pave Diamond Engagement Ring 2.19CtTW, TIFFANY & CO PLATINUM 1.14ct DIAMOND ENGAGEMENT RING, Platinum Tiffany & Co. Round & Pear Shapes Diamond Ring, Tiffany & Co Platinum 1.01ct G VS1 Diamond + 0.35ct Channel Band Engagement Ring, Tiffany & Co 18k diamonds set ring necklace earrings bracelet set Streamerica , Tiffany & Co PLAT Round & Pear Diamond Engagement Ring 1.56CT TRIPLE EXCELLENT, TIFFANY & CO PLAT 1.71ct THREE STONE EMERALD CUT & TRIANGULAR CUT DIAMOND RING, TIFFANY & CO PLATINUM 13.07ct AQUAMARINE & DIAMOND RING, AUTHENTIC! TIFFANY & CO PLATINUM THREE STONE DIAMOND 1.40CTW RING BAND, Tiffany & Co PLAT Sapphire Diamond 3-Stone Ring 3.14CT, Tiffany & Co Platinum 1.26ct I VVS1 Round Diamond Solitaire Engagement Ring , Tiffany & Co. Solitaire Diamond Engagement Ring - 1.29C/F/VS1, TIFFANY & CO. PLATINUM DIAMOND RING 1.04 E, VS1 , $20K Tiffany & Co 1.01 ct F VVS1 Lucida platinum rectangular diamond ring - MPRS, TIFFANY & CO. Etoile Platinum Diamond Engagement Ring & Wedding Band, $31875 1.62CT GIA CERT TIFFANY & CO. 3 STONE DIAMOND ENGAGEMENT RING PLAT VS , Vintage Tiffany & Co. Diamond Ring, Tiffany & Co.1.16ct VS1 / H Round Cut Platinum & Diamond Engagement Ring, Tiffany & Co. Round 1.41 Total Brilliant Diamond Platinum Engagement Ring I VS1, Tiffany & Co. 1.18 Total Round Brilliant Diamond Platinum Engagement Ring H VS2, TIFFANY & CO Platinum Baguette 4ct Diamond Band Ring , Tiffany & Co Plat Lucida & Baguette Diamond Engagement Ring 1.12CT G-VS1, TIFFANY & CO PLATINUM 1.06ct G VS1 DIAMOND ENGAGEMENT RING WEDDING BAND SET, Tiffany & Co PLAT Marquise Diamond Solitaire Engagement Ring 1.16CT H-VVS2, TIFFANY & CO 1.01CTW DIAMOND SOLITAIRE ENGAGEMENT PLATINUM RING EGL USA VS #2374, TIFFANY & CO PLAT ROUND DIAMOND SOLITAIRE X RING HVVS2, TIFFANY & CO EMERALD CUT DIAMOND 1.01 F VS1.....ENGAGEMENT RING W/ BOX & PAPERS!,